Spark plug



F. KAPP SPARK PLUG Dec. 24, 1940.

Original Filed Sept. 16, 1939 Patented Dec. 24, 1940 PATENT OFFICE SPARK PLUG Fred Kapp, Oakland, cait;

Original application September 16, 1939, Serial No. 295,266. Divided and this application March 5, 1940, Serial No. %2,276

2 Claims.

electrode serving to split the supplied spark for' two parallel channels, thus keeping the spark alive lon ger and producing a, hotter spark for better combustion.

An additional object of the invention is the provision of means that serve to retain the cleanliness of the points or electrodes and the prevention, of the eliminaton of carbon thereon or therefrom.

An additional objectof the invention is the provision of a spark plug that is exceedingly 4 simple and inexpensive to manuiacture or repair, should any of its parts become broken or injured, and a spark plug wherein the life thereof is prolonged because of the unique structural arrangement employed.

Other objects and advantages of the invention will become apparent from the following description and explanation.

In the accor'panying drawing forming a part of this specification and in which like numerals are employed to designate like parts throughout the same,

Flg. 1 is a view in elevation of a spark plug embodying my invention and disclosing to advantage the points or electrodes forming the subject matter of the present invention;

Fig. 2 is a longitudinal section of the spark plug constructed in accordance with my invention; i

Fig. 3 is a bottom plan view of the same; and

Fig. 4 is a detailed view in perspective and on an enlarged scale of one of the V-type ground.

In devising the present invention I have taken into consideration the provision of means to provide the hottest possible' spark, which is discharged between a fixed spark gap between the central electrode and a new V-type single ground hollow' channel electrode.

It is a well-known fact that the more current (Cl. 123-169) t that can flow to the spark plug ground electrode and can be keptalive, then the hotter the spark, which hot spark is required for present types of fuel used in modern high compression and high speed motors. 5

In carrying out the objects of the present invention, it will be noted that the numeral 'l designates a central hollow metallic shell or casing of a spark plug adapted to receive therein an insulated core 8. The said casng has its 10 lower portion externally threaded, as at 9, to engage an opening in the cylinder of an internal combustion engine, while its upper portion is formed with an angular head ID, which can be engaged by a wrench for positioning the plug in 15 place. The numeral ll indicates a gland nut that has threaded connection with internal threads z of the angular head lfl oi the spark plug casing, and the said nut tends to retain in place the insulated core 8 after it has been fitted in the hollow casing 1.

Extending through the bore |3 of the insulated core is a primary or central electrode, designated as a whole by the reference character A, while the reference character B designates as a whole the ground or shell electrode.`

Definite type gaskets are employed as compression seals, and, likewise, a nut M is utilized to fasten the electrode to one of the current wires of the ignitionsystem. 30

The present description refers to a type of spark plug in which my improved ground electrode is utilized.

It might be mentioned that before a spark can bridge the fixed spark gap, the compressed gases lying between. the central and ground electrode spark gap must be fully ionized. With the present conventional type of spark plug and electrode constructions, these ions are blown away too rapidly with the incoming gas stream occurr'ing in the intake cycle. It is for this reason that I .have devised. the present improved v-type electrode that embodies in its construction the upturned end IS that is Secured to the 45 threaded extremity 9 of the casing 1. It will be noted that this end portion has integrally formed therewith a v-type channel portion 's provided with two upper fiat surfaces l'I and !8. By virtue of this construction the spark touches 50 the two upper surfaces l'l and I 8 and then escapes into the channel, thus lengthening the spark life and assuring a hotter and better combustion. p

It is to be understood that the form of my in- 55 vention herewith shown and described is to be taken as a preferred example of the same and that various changes relative to the material, size, shape and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. In a spark plug equipped with a. metal housing and having an insulating member positioned within said housing, a central electrode mounted in said insulator, and a ground electrode carried by said metal housing, said ground electrode including in its constructon a. channel forming a. 

